Under normal conditions, polar bodies don t participate the embryo development and are small non - function cells.
长久以来, 人们都认为极体在正常情况下不参与动物的胚胎发育而退化,是无功能的小细胞.
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Acute and chronic graft rejection are the major factors leading to graft non - function.
器官移植术后急、慢性排斥反应是导致移植物功能丧失的重要原因之一.
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